JPH0610337Y2 - Shutter device - Google Patents

Description

The present invention relates to a shutter device provided in an optical system.

2. Description of the Related Art A shutter device is provided in, for example, an optical system of a slit exposure scanning type copying machine. This type of shutter device is provided in the optical path to remove the necessary light because it is necessary to prevent the photosensitive drum from being exposed to light when the scanning mirror returns.

A conventional shutter device has, for example, a structure shown in FIG. Shutter blades 1 and 2 are attached to rotating shafts 3 and 4, respectively. One ends of interlocking plates 5 and 6 are connected to the shutter blades 1 and 2, respectively. This interlocking plate 5,
The other end of 6 is connected to the shaft 9 of the solenoid 8. A spring 7 is attached to the connecting portion between the interlocking plates 5 and 6 and the shaft 9.

As the shaft 9 of the solenoid 8 moves in the direction of arrow Z in FIG. 5 against the force of the spring 7, the shutter blades 1,
2 rotates in the directions of arrows X and Y, respectively. As a result, the shutter blades 1 and 2 are closed to block light.

The problem to be solved by the invention is that in this conventional shutter device, as shown in FIG. 5, when the shutter blades 1 and 2 are closed, the respective tips of the shutter blades 1 and 2 collide with each other and may not be tightened. It was

Therefore, as shown in FIG. 6, the tips of the shutter blades 1 and 2 are formed to have an L-shaped cross section, respectively.
An attempt was made to avoid hitting each tip of the. Alternatively, as shown in FIG. 7, the rotary shafts 3 of the shutter blades 1 and 2,
An attempt was made to shift the position of 4 so that the respective tips of the shutter blades 1 and 2 would not collide.

However, in the conventional example of FIG. 6, the shutter blades 1,
In the state where 2 is closed, the gap D1 is formed. Further, in the conventional example of FIG. 7, the gap D2 is formed.
Therefore, in any case, it cannot be actually adopted because the light shielding is incomplete.

DISCLOSURE OF THE INVENTION This invention has been made to solve the above-mentioned problems, and a shutter that can be reliably opened and closed without a plurality of shutter members colliding with each other, and when closed, does not form a gap and can reliably shield light. The purpose is to provide a device.

SUMMARY OF THE INVENTION Therefore, according to the present invention, an optical system is provided, a plurality of shutter members and a driving source are provided, and an interlocking member is connected between each shutter member and the driving source. In the shutter device, which is configured to rotate in the opposite direction to close and shield the light, an intermediate connecting member is provided between each of the interlocking members and the drive source, and the intermediate connecting member is provided when rotating each shutter member. The gist of a shutter device is characterized in that the shutter device is provided with a biasing means for rotating so as to shift the timing of rotation of the device according to the difference in their rotational speeds.

Means for Solving Problems Reference is made to FIG.

The shutter device is set in the optical system. The shutter device has a first shutter member 10, a second shutter member 11, and a drive source (solenoid 26 in the embodiment). A first interlocking member 15 is connected to the first shutter member 10. A second interlocking member 18 is connected to the second shutter member 11. An intermediate connecting member 22 is provided between the first interlocking member 15, the second interlocking member 18, and the shaft 27 of the solenoid 26. Further, when the solenoid 26 is operated to rotate the first shutter member 10 and the second shutter member 11 in opposite directions, the urging means rotates the intermediate connecting member 22 so as to shift the rotation timing of each shutter member. (Spring 30 in the embodiment).

Operation FIGS. 1 and 2 show a state in which the first shutter member 10 and the second shutter member 11 are open. When the shaft 27 of the solenoid 26 moves in the direction of arrow Z in FIG. 2, the force of the spring 30 acts as shown in FIG. 3, and the intermediate connecting plate 22 rotates clockwise as shown in FIG. The first shutter member 10 rotates before the second shutter member 11.

As shown in FIG. 4, when the rotation of the first shutter member 10 is first closed and then stopped, the second shutter member 11 is then closed so as to overlap the tip of the first shutter member 10. At this time, the intermediate connecting plate 22 rotates counterclockwise in FIG.
The state returns to the state of the intermediate connecting plate 22 in the figure.

Example Referring to FIG. The shutter device of the present invention is set in the optical system of a slit exposure scanning type copying machine, for example.

The shutter device includes a first shutter member 10 and a second shutter member 11. The first shutter member 10 is rotatable about the shutter shaft 12 in the arrow X direction. The second shutter member 11 is the shutter shaft 1.
It is possible to rotate about 3 in the direction of the arrow Y.

The first shutter member 10 and the second shutter member 11 are
In the open state, they are parallel as shown in FIG.
The shutter shafts 12 and 13 are oriented in a direction orthogonal to the optical axis of the optical system. A stopper 14 is provided at a substantially intermediate position between the shutter shaft 12 and the shutter shaft 13.

A first interlocking member 15 is connected to the first shutter member 10. One end 16 of the first interlocking member 15 is connected to the first shutter member 10 via a pin 17. Meanwhile, the second
A second interlocking member 18 is connected to the shutter member 11. One end 19 of the second interlocking member 18 is connected to the second shutter member 11 via the pin 20.

The other end 21 of the first interlocking member 15 is connected to the intermediate connecting member 22 via a pin 23. The second interlocking member 18
The other end 24 of is connected to the intermediate connecting member 22 via a spring hook 25.

The shaft 27 of the solenoid 26 is connected to the intermediate connecting member 22 via a pin 28. The arrow Z direction of the shaft 27 is along the optical axis of the optical system. The intermediate connecting member 22 is a plate having an isosceles triangular shape in this embodiment. The pin 23 and the spring hook 25 are respectively located on the two bottom corner sides of the intermediate connecting member 22 having an isosceles triangular shape. The pin 28 is located on the apex side.

A spring 30 is provided between the spring hook 25 and another spring hook 29.
Is provided. The central axis of operation of the spring 30 is eccentric from the central axis of operation of the shaft 27 of the solenoid 26. The spring 30 has a function of applying a restoring force to the shaft 27 of the solenoid 26 when the solenoid 26 is not energized. Further, the spring 30 serves as the first shutter member 10
It also has a function of rotating the intermediate connecting member 22 when rotating the second shutter member 11.

The stopper 32 is located at a position corresponding to the intermediate connecting member 22, and is for preventing the shaft 27 from moving too much in the direction opposite to the arrow Z direction.

The stopper 14, the first movement member 15, the second movement member 1
8, spring hooks 25 and 29, stopper 32, intermediate connecting member 22, solenoid 26, spring 30, shutter shaft 1
2 and 13 are set at positions that do not obstruct the optical path. Further, the stoppers 14, 32, the shutter shafts 12, 1
3, the solenoid 26, and the spring hook 29 are attached to the frame (not shown) of the copying machine.

Next, the operation of the above-mentioned shutter device will be described with reference to FIGS.

First, referring to FIG. The first shutter member 10 and the second shutter member 11 are in an open state. The first shutter member 10 and the second shutter member 11 are parallel to each other, and in this embodiment, parallel to the optical path of the optical system. Intermediate connecting member 2
No. 2 hits the stopper 32.

When the solenoid 26 is energized, the shaft 27 moves in the direction of arrow Z.
Start moving in the direction. This Z direction is parallel to the optical path.
When the shaft 27 moves in the arrow Z direction against the force of the spring 30, as shown in FIG.
Fig. 3 Rotate clockwise around. Therefore the first
The relative position of the interlocking member 15 and the second interlocking member 18 is displaced,
The first shutter member 10 rotates to the side of the intermediate connecting plate 22 before the second shutter member 11. Therefore, the tip of the first shutter member 10 wraps around before the tip of the second shutter member 11, and the first shutter member 10 and the second shutter member 11
The rotation timings of and are not deviated, and both tips do not collide and interfere with each other. The first shutter member 10 rotates in the arrow X direction, and the second shutter member 11 rotates in the arrow Y direction.

When the shaft 27 further moves in the arrow Z direction as shown in FIG. 4, the first shutter member 10 contacts the stopper 14. Next, the second shutter member 11 is the first shutter member 1
Close while overlapping 1. In this state, the intermediate connecting member 22 rotates counterclockwise around the pin 28 from the state shown in FIG. Therefore, the intermediate connecting member 22 in FIG.
The state returns to the original state shown in FIG. In this way, the first shutter member 10 and the second shutter member 11 are in close contact with each other without a gap in the overlapping portion,
Complete shading.

Next, when the first shutter member 10 and the second shutter member 11 are opened again, the energization of the solenoid 26 is stopped and the shaft 27 is moved by the force of the spring 30 in the direction opposite to the arrow Z direction in FIG. . Then, the intermediate connecting member 22 is again rotated clockwise about the pin 28 in FIG. 4 by the force of the spring 30. Therefore, the first interlocking member 15
And the relative position of the second interlocking member 18 shifts, and the second shutter member 11 first starts to open in the direction opposite to the arrow Y direction. After that, the first shutter member 10 starts to open in the direction opposite to the arrow X and is separated from the stopper 14.

Then, the state becomes as shown in FIG. When this is opened, the second shutter member 11 opens before the first shutter member 10, so that the tip of the first shutter member 10 and the tip of the second shaft member 11 do not abut and interfere with each other.

When the shaft 27 further moves in the direction opposite to the arrow Z direction, it returns to the state shown in FIG. That is, the intermediate connecting member 22 hits the stopper 32, and the intermediate connecting member 22 rotates counterclockwise from the state shown in FIG. 3 around the pin 28 to return to the state shown in FIG. In this state, the first shutter member 10 and the second shutter member 11 become parallel again and the optical path is completely opened.

Even when performing such an operation, it is not necessary to lengthen the stroke of the solenoid, and it is not necessary to increase the size of the solenoid to cover the power shortage when the stroke is long. A compact one will do.

By the way, this invention is not limited to the above embodiment. For example, the intermediate connecting member 22 is not limited to an isosceles triangle or an equilateral triangle. Further, the drive source is not limited to the solenoid. Further, the direction of the shutter shaft does not necessarily have to be perpendicular to the optical path.

Effect of the Invention As is clear from the above description, the shutter members can be opened and closed reliably and smoothly without mutual interference of the shutter members, and when closed, the gap between the shutter members is eliminated to completely shield light. You can

In the present invention, when the plurality of shutter members are rotated, the movement of none of the shutter members is stopped and the rotation timing is shifted according to the difference in their rotational speeds, so that a quick operation can be obtained.

[Brief description of drawings]

FIG. 1 is a perspective view showing a preferred embodiment of the shutter device of the present invention, and FIG. 2 is a view showing a state in which a shutter member is opened,
FIG. 3 is a diagram showing a state where the shutter member is rotated to an intermediate position, FIG. 4 is a diagram showing a state where the shutter member is closed, and FIGS. 5 to 7 are diagrams showing a conventional shutter device. 10 ... First shutter member 11 ... Second shutter member 15 ... First interlocking member 18 ... Second interlocking member 22 ... Intermediate connecting member 26 ... Solenoid 27 ... Shaft 30 ... Spring

Claims (1)

[Scope of utility model registration request] 1. An optical system, which has a plurality of shutter members and a driving source, and an interlocking member is connected between each shutter member and the driving source. In the shutter device which is rotated by closing the shutter member so that light can be shielded, an intermediate connecting member is provided between each of the interlocking members and the driving source, and when the shutter members are rotated, the timing of rotation of each shutter member is set to those. A shutter device comprising an urging means for rotating the intermediate connecting member so as to shift the intermediate connecting member according to a difference in rotational speed.